S
M
T
W
T
F
S
26
57°
43°
27
59°
40°
28
68°
41°
29
58°
37°
30
61°
43°
1
65°
44°
2
60°
40°
3
64°
44°
4
68°
48°
5
71°
50°
6
71°
50°
7
72°
52°
8
73°
52°
9
73°
51°
10
66°
48°
11
63°
45°
12
64°
46°
13
70°
50°
14
64°
47°
15
66°
46°
16
71°
53°
17
74°
53°
18
69°
44°
19
71°
44°
20
67°
44°
21
68°
45°
22
67°
46°
23
68°
47°
24
66°
54°
25
69°
55°
26
76°
52°
27
77°
52°
28
71°
60°
29
79°
57°
30
80°
48°
31
72°
53°
1
73°
53°
2
75°
54°
3
78°
56°
4
80°
52°
5
82°
49°
6
73°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Knox
Knox's May 2026 forecast shows daily high temperatures ranging from 57° to 82°, with overnight lows between 37° and 60°. The average high for May is 70° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Knox. See also: June | July | August.
